I'd see it as an event for members to invite customers (social) and demonstrate the breadth of 90 Minds (goodwill) membership. We could even have a short discussion on how to get the most out of Summit, possibly have Sage representatives attend.
Ultimately maybe this is just a more efficient way to host one gathering rather than say 4-5 members struggling to pull together their own social event.
Admittedly this will conflict with the larger members - like Blytheco - who have their own customer events.